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  Pattern matching systemUSPTO Application #: 20070223819Title: Pattern matching system Abstract: A pattern matching system, comprising a receiver, a comparison block, a calculation block, an output block, a ratio reading block, and a controller, is provided. A likeness value indicates how much a first and second image accords to each other. The receiver receives first and second image signal corresponding to the first and second images as an area signal. The comparison block compares the signal levels of the area signals corresponding to the pattern areas at the relatively same location of the first and second images. The calculation block calculates the likeness value. The ratio reading block reads a amplification ratio by which the first and second image signals are amplified. The controller changes the type of the signal components of the area signal used for the comparison by the comparison block and the calculation of the likeness value by the calculation block. (end of abstract) Agent: Greenblum & Bernstein, P.L.C - Reston, VA, US Inventor: Yasuhiro YAMAMOTO USPTO Applicaton #: 20070223819 - Class: 382218 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070223819. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]1. Field of the Invention [0002]The present invention relates to a pattern matching system that determines how much a plurality of images accords to each other. [0003]2. Description of the Related Art [0004]A pattern matching system that determines how much a plurality of images compares to each other is known. In the known pattern matching system, the entire captured image is divided into smaller pieces and the luminance values of the individual pieces are compared to the luminance values of corresponding pieces in the same location of different image. The determination of how similar the compared images are to one another is based on the number of corresponding pieces that have the same luminance values. In such a pattern matching method, it is difficult to carry out the pattern matching accurately when the brightness of the images varies substantially. SUMMARY OF THE INVENTION [0005]Therefore, an object of the present invention is to provide a pattern matching system that accurately carries out the pattern matching for images with a wide variation in brightness. [0006]According to the present invention, a pattern matching system, comprising a receiver, a comparison block, a calculation block, an output block, a ratio reading block, and a controller, is provided. The pattern matching system outputs a likeness value. The likeness value indicates how much a first and second image accords to each other. The receiver receives a first and second image signal corresponding to the first and second images, respectively, as an area signal. The area signal comprises first and second color signal components or luminance and chrominance difference signal components corresponding to the color of a pattern area of which the first and second images are comprised. The comparison block compares signal levels of the area signals corresponding to the pattern areas at the relatively same location of the first and second images. The calculation block calculates the likeness value. The likeness value varies according to the number of the pattern areas where the absolute value of the difference between the compared signal levels of the area signal of the first and second images is less than a predetermined standard value. The output block outputs the likeness value. The ratio reading block reads an amplification ratio by which the first and second image signals are amplified. The controller changes the type of the signal components of the area signal used for the comparison by the comparison block and used for the calculation of the likeness value by the calculation block. [0007]Further, the controller orders the comparison block and the calculation block to compare signal levels and to calculate the likeness value, respectively, using only the first color signal component or the luminance signal component when the amplification ratio is greater than a predetermined threshold value. The controller orders the comparison block and the calculation block to compare signal levels and to calculate the likeness value, respectively, using the first and second color signal components or the luminance and chrominance difference signal components when the amplification ratio is less than a predetermined threshold value. [0008]According to the present invention, a pattern matching system, comprising an image signal generator, a detection block, a selection block, and a pattern matching block, is provided. The pattern matching system estimates how similar a first and second image are to one another. The image signal generator generates plural types of image signals corresponding to the first and second images. The detection block detects the brightness of the first and second image. The selection block selects a number of different types of the image signals for pattern matching based on the detected brightness so that an increase in the number of the selected types is directly proportional to the detected brightness. The pattern matching block carries out pattern matching of the first and second image using the selected type of image signal. [0009]Further, the selection block selects a singular type of the image signal when the detected brightness is less than a predetermined brightness. BRIEF DESCRIPTION OF THE DRAWINGS [0010]The objects and advantages of the present invention will be better understood from the following description, with reference to the accompanying drawings in which: [0011]FIG. 1 is a block diagram showing the internal structure of a digital camera having a pattern matching system of a first embodiment of the present invention; [0012]FIG. 2 is a block diagram showing the structure of the light-receiving surface of the imaging device; [0013]FIG. 3 is a block diagram showing the internal structure of the DSP of a first embodiment; [0014]FIG. 4 is a block diagram showing the internal structure of the pursuit block of a first embodiment; [0015]FIG. 5 shows the light-receiving surface for explaining the form of the scanning area comprising pixel blocks; [0016]FIG. 6 shows the structure of the ERA of the imaging device; [0017]FIG. 7 shows a location of the CA1 relative to the SA; [0018]FIG. 8 shows a location of the CA2 relative to the SA; [0019]FIG. 9 shows a location of the CA3 relative to the SA; [0020]FIG. 10 shows a location of the CA4 relative to the SA; [0021]FIG. 11 shows a location of the CA5 relative to the SA; Continue reading... Full patent description for Pattern matching system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pattern matching system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Pattern matching system or other areas of interest. ### Previous Patent Application: System and methods for automatic parameter determination in machine vision Next Patent Application: Image capturing apparatus and face area extraction method Industry Class: Image analysis ### FreshPatents.com Support Thank you for viewing the Pattern matching system patent info. 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